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sarkisderderian / scalafx

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Consider providing "casting fix" for properties with "primitive" type values #122

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
There are situations where binding between properties holding primitive Java 
types does not work. There is an example of that in this StackOverflow question:
http://stackoverflow.com/questions/21671799/strange-type-mismatch-error

Here is a summary of the code

  case class Error(source: String, message: String, fixed: Boolean=false)

  var errorFixed: TableColumn[Error, Boolean] = ...

  errorFixed.cellValueFactory = features =>
    BooleanProperty(features.value.fixed)

This should intuitively work but fails with error:

[error] ...: type mismatch;
[error]  found   : scalafx.beans.property.BooleanProperty
[error]  required: scalafx.beans.value.ObservableValue[Boolean,Boolean]
[error]     errorFixed.cellValueFactory = features =>  
BooleanProperty(features.value.fixed)

the full type here is
  ObservableValue[scala.Boolean, java.lang.Boolean]

Interestingly adding cast:

BooleanProperty(features.value.fixed).asInstanceOf[ObservableValue[Boolean, 
Boolean]]

makes it work. This may be a hint on "making" it work in ScalaFX code (?).

Original issue reported on code.google.com by jpsacha on 18 Feb 2014 at 3:37

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